Design of a backlight module with a freeform surface by applying the Taguchi method

Yingcong Chen; Shangsheng Wen; Pengcheng Song

doi:10.3788/COL201513.032302

Journals >Chinese Optics Letters >Volume 13 >Issue 3 >Page 032302 > Article

Chinese Optics Letters
Vol. 13, Issue 3, 032302 (2015)

Design of a backlight module with a freeform surface by applying the Taguchi method

Yingcong Chen¹, Shangsheng Wen^1、2、*, and Pengcheng Song¹

Author Affiliations

¹Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China

²State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

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DOI: 10.3788/COL201513.032302 Cite this Article Set citation alerts

Yingcong Chen, Shangsheng Wen, Pengcheng Song. Design of a backlight module with a freeform surface by applying the Taguchi method[J]. Chinese Optics Letters, 2015, 13(3): 032302 Copy Citation Text

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Abstract

A novel structure, called a “freeform surface,” is integrated into a direct type light-emitting diode backlight. By applying the Taguchi method, the performance of this backlight is optimized. The Taguchi experiments are configured in

L_{9} (3^{4})

orthogonal arrays and are simulated via LightTool analysis software. After that, the influence of the design parameters on the luminance and uniformity are separately evaluated by analysis of variance (ANOVA). Next, the parameters are optimized, and a new backlight structure with desirable performance is designed at last. LightTool simulation shows that this new type of backlight is just 15 mm thick and has 310.3 nits luminance and 83.5% uniformity.

x_{0} (x - x_{0}) + y_{0} (y - y_{0}) + \tan θ_{0} \sqrt{x_{0}^{2} + y_{0}^{2}} (z - z_{0}) = 0,

(1)

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{\begin{matrix} R, θ ϵ (0, θ_{1}) \cup (θ_{2}, π), φ ϵ (0, φ_{1}) \cup (φ_{2}, π) \\ x_{0} (\frac{R}{\cos θ \cos φ} - x_{0}) + y_{0} (\frac{R}{\cos θ \sin φ} - y_{0}) + \tan θ_{0} \sqrt{x_{0}^{2} + y_{0}^{2}} (\frac{R}{\sin θ} - z_{0}) = 0, θ \in (θ_{1}, θ_{2}), φ ϵ (φ_{1}, φ_{2}) \end{matrix} .

(2)

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N \approx \frac{A_{backlight} L_{peak}}{T_{LCD} E_{cavity} G_{0} Φ_{LED}} \int_{0}^{2 π} \int_{0}^{π / 2} f (θ, φ) \sin θ \cos θ d θ d φ,

(3)

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η = - 10 \log \frac{\sum_{i = 1}^{n} \frac{1}{y_{i}^{2}}}{n},

(4)

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ρ = \frac{S S_{d}}{S S_{t}},

(5)

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S S_{t} = S S_{d} + S S_{e},

(6)

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S S_{t} = S S_{d} = \sum_{i = 1}^{n_{i}} {(η_{i} - η_{n})}^{2},

(7)

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Yingcong Chen, Shangsheng Wen, Pengcheng Song. Design of a backlight module with a freeform surface by applying the Taguchi method[J]. Chinese Optics Letters, 2015, 13(3): 032302

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